OFFSET
1,2
REFERENCES
I. Reiner, On the number of matrices with given characteristic polynomial, Illinois J. Math. 5 1961 324-329.
FORMULA
a(n) = (q/(q-1))*(q^(n^2-n)-q^(-2*n+n^2)) where q = 3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com) and W. Edwin Clark, Nov 29 2003
EXTENSIONS
Added more terms - Joerg Arndt, Oct 04 2013
STATUS
approved